Malicious PDF — malware analysis report

Static analysis result for SHA-256 69e729293062ae58…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 17:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 74ad3857ff7a8a164a505260896fbe8c SHA-1: ad76e933d2034e728d09a5c9469e760a80ad4d9d SHA-256: 69e729293062ae58a5b222f0a4a01dcd839904a2b2caa9becd663dc2c05a2627
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=pdf+to+excel+converter+download+free PDF link annotation
    • http://palaciodelosnavas.com/userfiles/file/68352444712.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/wejopininorab.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f0246807b---88365421612.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607975f92ddb0---73250400768.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/kivewijov.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/jugeva.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/78825965232.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/benexokerexos.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e61a57b811---31662386950.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/21657267709.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/78584995664.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0296f31b84---kefurabejujutege.pdfIn PDF document text
    • http://chikatere.com/Upload/files/75544459373.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfe808f421---jefemikanunita.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d1aa0881c---kabusu.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9392219d06---retalikafajusavowa.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c51aa2356645ed24560d942859e05aa3/94683033171.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/sesozezirofagaramosikab.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/e1b246662c0da61fb027e2ca9de0e900/61765528574.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/9e5f3c7f1e3cf2c17b5905f6d6019728/75257347381.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/viribagoruwukizuxefax.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/duxaximowukovasepokib.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD757 17040 bytes
SHA-256: cec1b46bd3964ff962cea4bb8d68379e6934008cc60b69628950f63d1368a239
font_01_sfnt_off00010343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10343 10464 bytes
SHA-256: 012e993146928ad058c55031270f39ef870fb4ba62fbea33c7c1df8e644e0277
font_02_sfnt_off00011b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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